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Related Party Transactions and Investments in Non-Consolidated Entities - Sponsored REIT Loans outstanding (Details)
 6 Months Ended
Jun. 30, 2016
USD ($)
loan
Jun. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Sponsored REITs      
Number of Sponsored REIT loans which bear interest at a fixed rate | loan 2    
Maximum amount of loan $ 90,300,000    
Amount Drawn $ 79,310,000   $ 118,641,000
Sponsored REITs      
Sponsored REITs      
Term of sponsored REIT loan secured by mortgage, minimum 1 year    
Term of sponsored REIT loan secured by mortgage, maximum 3 years    
Interest income and fees from the Sponsored REIT Loans $ 2,450,000 $ 2,539,000  
FSP Monument Circle LLC      
Sponsored REITs      
Origination fee 164,000    
Exit fee 38,000    
FSP Energy Tower I Corp.      
Sponsored REITs      
Extension fee 108,900    
Secured revolving lines of credit | FSP Satellite Place Corp.      
Sponsored REITs      
Maximum amount of loan 5,500,000    
Amount Drawn $ 3,710,000    
Sponsored REIT loans, base rate 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent) 4.40%    
Draw Fee (as a percent) 0.50%    
Interest rate (as a percent) 4.87%    
Secured revolving lines of credit | FSP 1441 Main Street Corp.      
Sponsored REITs      
Maximum amount of loan $ 10,800,000    
Amount Drawn $ 9,000,000    
Sponsored REIT loans, base rate 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent) 4.40%    
Draw Fee (as a percent) 0.50%    
Interest rate (as a percent) 4.87%    
Secured revolving lines of credit | FSP Energy Tower I Corp.      
Sponsored REITs      
Maximum amount of loan $ 20,000,000    
Amount Drawn $ 12,600,000    
Sponsored REIT loans, base rate 30-day LIBOR    
Sponsored REIT loans, base rate margin (as a percent) 5.00%    
Draw Fee (as a percent) 0.50%    
Interest rate (as a percent) 5.47%    
Mortgage loan secured by property | FSP Monument Circle LLC      
Sponsored REITs      
Maximum amount of loan $ 21,000,000    
Amount Drawn $ 21,000,000    
Fixed rate of interest (as a percent) 4.90%    
Interest rate (as a percent) 4.90%    
Mortgage loan secured by property | FSP Energy Tower I Corp.      
Sponsored REITs      
Maximum amount of loan $ 33,000,000    
Amount Drawn $ 33,000,000    
Fixed rate of interest (as a percent) 6.41%    
Interest rate (as a percent) 6.41%